Justin Bieber's manager: "Justin got very light of breath. The whole show he's been complaining." Footage courtesy Kirk Kelly.
Pop star Justin Bieber was treated by doctors after suffering breathing problems during his concert at London's O2 Arena, his spokeswoman has said.
Melissa Victor told the Reuters news agency the Canadian singer took a 20-minute rest before returning to the stage to finish the show.
The 19-year-old star was performing the third out of four nights at the venue.
Earlier this week he was criticised for keeping fans waiting after coming on stage late for Monday's performance.
Ms Victor said after the concert: "[Justin's] heading to the doctor now. He fainted and took a 20-minute reprieve and was given oxygen."
In a video posted by a fan on YouTube, Bieber's manager Scooter Braun was seen on stage during the show giving the audience an explanation as to why the show had come to a temporary halt. He told fans: "Justin got very light of breath, the whole show he's been complaining. He's backstage with the EMTs [emergency medical team] and the doctor.
"They're telling him they want him to go and see somebody and find out what's going on with his lungs, he's just told me that in five minutes, if it's OK with you guys, he's going to come out and finish the show.
"So he might not be jumping around as much and everything else, you guys need to be patient with us, we're not trying to be disrespectful, we're not trying to get you guys home late, we're truly trying to put on a show for the people who love him."
Bieber did then come back on stage and completed the show, before being examined by medical staff after its conclusion. It has not been confirmed whether he needed to attend hospital.
The star later tweeted a message to his 35.6 million followers on Twitter, in which he said: "Getting better. Thanks for everyone pulling me thru tonight. Best fans in the world. Figuring out what happened. Thanks for the love."
Bieber has had a whirlwind fortnight in the UK, being photographed in several nightclubs, in between his concerts in Manchester, Liverpool, Birmingham, Nottingham and London.
The Believe world tour is due to continue until August, with 125 dates in total. Bieber made headlines on the very first show in Glendale, Arizona, last September when he was seen vomiting on stage but managed to finish the concert.
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